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how do I negate a sed match

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Top Forums Shell Programming and Scripting how do I negate a sed match
# 1  
Old 09-29-2006
how do I negate a sed match
I have a text file that has links in it.

I can write a match for sed to replace the link with anything.

For example:
Code:
http://www.google.com 
becomes
XxX

But what I'm after is not to replace the link with something but to remove everything else and just leave the link. I want a negative match. So that everything that matches is left alone but all non-matching text is removed.

Any ideas?
# 2  
Old 09-29-2006
Code:
sed "/http:\/\/www.google.com/!d" file

! - negate the match
# 3  
Old 09-29-2006
Quote:
Originally Posted by anbu23
Code:
sed "/http:\/\/www.google.com/!d" file

! - negate the match
That deletes the match. What I'm after is to negate it. Instead of replacing the match, replace EVERYTHING ELSE and leave the match alone.
# 4  
Old 09-29-2006
can you show some example?
# 5  
Old 09-29-2006
Quote:
Originally Posted by muxman
That deletes the match. What I'm after is to negate it. Instead of replacing the match, replace EVERYTHING ELSE and leave the match alone.
Alternative in Python:
Code:
#!/usr/bin/python
all = open("file1.txt").read()
allwords = all.split()
for i in range(0,len(allwords)):
	if not "http://www.google.com" in allwords[i]:
 		allwords[i] = "xXx"
print ' '.join(allwords)

Output:
Code:
'xXx xXx http://www.google.com xXx xXx xXx'

# 6  
Old 10-04-2006
use the -n option of sed, for example:

sample file link.txt contains:
text
http://www.google.com
text
https://www.unix.com
last line

filter file link.flt contains:
1,$ {
/http:\/\// {
p
}
}

$ sed -n -f link.flt link.txt
http://www.google.com
https://www.unix.com
$
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